Brie Larson Filmed Avengers: Endgame Before Captain Marvel

"I had to stumble and figure out who this character was with no script for this," Larson said.

While the cast and filmmakers were understandably tight-lipped about what happens in Avengers: Endgame during Sunday's press conference for the Marvel film, Captain Marvel actress Brie Larson did confirm longstanding rumors about which MCU film was her first.

"This film [Endgame] will always be personally dear to me because it was my first time playing Captain Marvel," Larson said from a stage that included several of her co-stars as well as directors Joe and Anthony Russo and producer Kevin Feige.

"We shot this first so I had to stumble and figure out who this character was with no script for this and no script for Captain Marvel either and perform for the first time in front of legends. But it was incredible," Larson recalled.

"This film deals with some heavy subject matters so you’re bouncing in-between things that feel very deep and serious and then you’re going off and playing Boggle, which I’m very good at just to be clear," she said about her time on set filming Avengers: Endgame. "And so there’s no other word I can describe it as a surreal.

"I’m super-excited for this to come out just so that I can talk about it. I really want to talk about my experience, which I haven’t been able to do for a very long time."